Changes
- Fix broken OS plugin.
- Reduce queryset filtering to once from twice (or maybe thrice) for machine datatable list views.
- Fixes #382 (KeyError for "unknown" management sources).
- Fix plugins which were setting datetime.datetime.now() once, globally being more and more off the longer Sal is up.
- Update Django, DRF, gunicorn, etc.
- Migrate DRF schema generation to current, explicit method.